(This version of the Sep. 11 story corrects the condition to hypothyroidism in paragraph 28) By Amanda Becker NEW YORK (Reuters) – Hillary Clinton is suffering from pneumonia, the Democratic presidential candidate’s personal doctor said on Sunday after she fell ill at a Sept. 11 memorial, an episode that renewed focus on her health less than two months before the election. Clinton canceled a trip she was scheduled to take to California on Monday for fundraising and other campaign events, an aide said, declining to provide further details about her schedule for the week. Clinton, 68, was diagnosed on Friday but her condition only came to light several hours after a video on social media appeared to show her swaying and her knees buckling before being helped into a motorcade as she left the memorial early Sunday.